// SPDX-License-Identifier: GPL-2.0-only
/*
 * Generic MIPI DPI Panel Driver
 *
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 */

#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>

#include <video/omapfb_dss.h>
#include <video/of_display_timing.h>

struct panel_drv_data {
        struct omap_dss_device dssdev;
        struct omap_dss_device *in;

        int data_lines;

        struct omap_video_timings videomode;

        struct gpio_desc *enable_gpio;
};

#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)

static int panel_dpi_connect(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (omapdss_device_is_connected(dssdev))
                return 0;

        return in->ops.dpi->connect(in, dssdev);
}

static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (!omapdss_device_is_connected(dssdev))
                return;

        in->ops.dpi->disconnect(in, dssdev);
}

static int panel_dpi_enable(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;
        int r;

        if (!omapdss_device_is_connected(dssdev))
                return -ENODEV;

        if (omapdss_device_is_enabled(dssdev))
                return 0;

        if (ddata->data_lines)
                in->ops.dpi->set_data_lines(in, ddata->data_lines);
        in->ops.dpi->set_timings(in, &ddata->videomode);

        r = in->ops.dpi->enable(in);
        if (r)
                return r;

        gpiod_set_value_cansleep(ddata->enable_gpio, 1);

        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

        return 0;
}

static void panel_dpi_disable(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (!omapdss_device_is_enabled(dssdev))
                return;

        gpiod_set_value_cansleep(ddata->enable_gpio, 0);

        in->ops.dpi->disable(in);

        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        ddata->videomode = *timings;
        dssdev->panel.timings = *timings;

        in->ops.dpi->set_timings(in, timings);
}

static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);

        *timings = ddata->videomode;
}

static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        return in->ops.dpi->check_timings(in, timings);
}

static struct omap_dss_driver panel_dpi_ops = {
        .connect        = panel_dpi_connect,
        .disconnect     = panel_dpi_disconnect,

        .enable         = panel_dpi_enable,
        .disable        = panel_dpi_disable,

        .set_timings    = panel_dpi_set_timings,
        .get_timings    = panel_dpi_get_timings,
        .check_timings  = panel_dpi_check_timings,

        .get_resolution = omapdss_default_get_resolution,
};

static int panel_dpi_probe_of(struct platform_device *pdev)
{
        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
        struct device_node *node = pdev->dev.of_node;
        struct omap_dss_device *in;
        int r;
        struct display_timing timing;
        struct videomode vm;
        struct gpio_desc *gpio;

        gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
        if (IS_ERR(gpio))
                return PTR_ERR(gpio);

        ddata->enable_gpio = gpio;

        r = of_get_display_timing(node, "panel-timing", &timing);
        if (r) {
                dev_err(&pdev->dev, "failed to get video timing\n");
                return r;
        }

        videomode_from_timing(&timing, &vm);
        videomode_to_omap_video_timings(&vm, &ddata->videomode);

        in = omapdss_of_find_source_for_first_ep(node);
        if (IS_ERR(in)) {
                dev_err(&pdev->dev, "failed to find video source\n");
                return PTR_ERR(in);
        }

        ddata->in = in;

        return 0;
}

static int panel_dpi_probe(struct platform_device *pdev)
{
        struct panel_drv_data *ddata;
        struct omap_dss_device *dssdev;
        int r;

        if (!pdev->dev.of_node)
                return -ENODEV;

        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
        if (ddata == NULL)
                return -ENOMEM;

        platform_set_drvdata(pdev, ddata);

        r = panel_dpi_probe_of(pdev);
        if (r)
                return r;

        dssdev = &ddata->dssdev;
        dssdev->dev = &pdev->dev;
        dssdev->driver = &panel_dpi_ops;
        dssdev->type = OMAP_DISPLAY_TYPE_DPI;
        dssdev->owner = THIS_MODULE;
        dssdev->panel.timings = ddata->videomode;
        dssdev->phy.dpi.data_lines = ddata->data_lines;

        r = omapdss_register_display(dssdev);
        if (r) {
                dev_err(&pdev->dev, "Failed to register panel\n");
                goto err_reg;
        }

        return 0;

err_reg:
        omap_dss_put_device(ddata->in);
        return r;
}

static void panel_dpi_remove(struct platform_device *pdev)
{
        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
        struct omap_dss_device *dssdev = &ddata->dssdev;
        struct omap_dss_device *in = ddata->in;

        omapdss_unregister_display(dssdev);

        panel_dpi_disable(dssdev);
        panel_dpi_disconnect(dssdev);

        omap_dss_put_device(in);
}

static const struct of_device_id panel_dpi_of_match[] = {
        { .compatible = "omapdss,panel-dpi", },
        {},
};

MODULE_DEVICE_TABLE(of, panel_dpi_of_match);

static struct platform_driver panel_dpi_driver = {
        .probe = panel_dpi_probe,
        .remove = panel_dpi_remove,
        .driver = {
                .name = "panel-dpi",
                .of_match_table = panel_dpi_of_match,
        },
};

module_platform_driver(panel_dpi_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
MODULE_LICENSE("GPL");